In the past few decades, physicists encountered many questions in neutrino and Dark Matter (DM) physics that can be addressed with similar technologies. Many mysteries in neutrino physics (three types of neutrino, neutrino mass differences, and neutrino oscillation mechanism) are yet unknowns, particularly the neutrino mass hierarchy, CP violation in the leptonic sector, and early supernova detection (example of multi-messenger astrophysics), to be answered. Understanding these unknowns could lead to the physics beyond the standard model, resolve the matter/anti- matter mystery, and explore the physics in a core-collapse supernova. On the other hand, the existence of DM has been confirmed by astrophysical and cosmological evidence but not yet been discovered. These seemingly different mysteries can be addressed using technology and analyses that I am an expert in and could even contain each other's solution. Sterile neutrinos can be an excellent dark matter candidate in minimal extensions of the standard model. On the other hand, the dark matter self-annihilation in many plausible dark matter models would produce the neutrinos that neutrino experiments can detect. These detector technologies are noble elements and liquid scintillators. The high scintillation light yield of argon and xenon, in particular, provides good energy resolution, and its low ionization potential makes it suitable for charge detection, which is essential for particle identification and self-shielding. A metal-doped liquid scintillator technique has also been utilized as the primary detector target for neutrino physics and as an active veto system due to its excellent neutron detection efficiency for DM searches. My main interest in research lies in developing instrumentation and data analysis methods to probe DM and neutrino physics.